It is the Hawks, i think our fan base has A.D.D. for suggesting anyone else. Boston is like a one time assaulter that hurt us and has gone away. Chicago is an enemy who lives next door, they vandalize your car, makes noise complaints to the police and insult your kids. With Boston you hate the memory of them. With Chicago you hate them.
Chicago - Annoying relatives that come around once in a while to trash your house and insult you.
Boston - Hoodlums that stole your car and vandalized your house a while ago. EDIT - and not only did they get away with it, they got commended by the community for it!
Calgary - Old high school enemy that hates you so much, but the rivalry has cooled down as of late.
Edmonton - The annoying fraternity next door that thinks they are so funny and great but they annoy the **** out of you with noise and pranks but get really bad grades.
Toronto - Some guy down the street that you really don't like for an inexplicable reason. When you walk by each other, you can feel the animosity, but nothing really happens.
Minnesota - A creepy kid that hated you in high school but you didn't care about and he still comes around once in a while to insult you.
Los Angeles - The hotshot new co-worker who got commended for work that he didn't do, but soon his work will be shown for what it really is.